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A Met Police spokesperson said: "The image of the man has been circulated to local officers, but, having been unable to trace him, police are asking for assistance from members of the public or for the man himself to come forward."

Anyone with information is urged to call PC Mike Willcox of the Safer Transport team at Brent on 020 8733 3809. To remain anonymous, call Crimestoppers on 0800 555 111.